Uniform Constellation Modulation for Flexible Power Split
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Solution Overview
Problem
Current wireless communication systems using non-orthogonal multiple access (NOMA) face challenges in efficiently managing power splits between transmission layers, leading to increased complexity and power consumption in de-mappers due to the use of non-uniform symbol constellations.
Innovation Solution
The implementation of a uniform constellation-based modulation order split transmission system, where a combined symbol constellation is down-selected from a larger uniform constellation, allowing for additional power split options without increasing de-mapper complexity, by using a fixed-bit width de-mapper and pre-determined symbol locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If non-uniform symbol constellations are used to provide additional power split options, then transmission flexibility is improved, but de-mapper complexity and power consumption increase
Solution Approach 1:
The patent changes the parameter of symbol constellation from non-uniform to uniform, allowing the system to maintain multiple power split options through parameter adjustments rather than structural changes. This enables transmission flexibility while keeping the de-mapper structure simple and fixed, directly resolving the contradiction between adaptability and device complexity.
2Adaptability or versatility
If non-uniform symbol constellations are used to support multiple power ratios, then power split options are increased, but power consumption in de-mappers increases
Solution Approach 1:
The patent enables multiple power split options by changing parameters of the uniform constellation (such as power allocation coefficients) rather than changing the constellation structure itself. This allows the de-mapper to handle different power ratios using the same hardware structure, reducing power consumption while maintaining versatility in power split options.
3Adaptability or versatility
If non-uniform symbol constellations are used for modulation order split transmissions, then transmission adaptability is improved, but chip area of de-mapper increases
Solution Approach 1:
The patent achieves transmission adaptability by using parameter changes in a uniform constellation framework rather than requiring multiple different constellation structures. This allows a single fixed-size de-mapper chip to support multiple transmission scenarios, preventing chip area increase while maintaining high transmission adaptability.
Data Source
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Figure 3B~3C
AI summary
A combined symbol constellation may be selected from a uniform symbol constellation that is supported by a de-mapper to provide additional power split options while reducing modifications to the de-mapper. In some examples, a signal may be constructed according to a combined symbol constellation selected from a larger uniform symbol constellation based on a desired power-ratio. The signal may include a base-layer, used to communicate a first set of data, and an enhancement-layer, used to communicate a second set of data, in accordance with the selected combined symbol constellation. The signal may be received and de-mapped according to the combined symbol constellation at a de-mapper that supports a uniform symbol constellation that is larger than the combined symbol constellation.